peaesall



(No Model.) 2 sheets-sheet 1.

. H. D. PEARSALL. HYDRAULIC APPARATUS FOR RAISING 0R FORUING WATER, &c.

- No. 587,063. Patented July 27, 1897.

0.. wisulum'ou o c (-No Model.) 2 Sheets.-Sheet H. D. PEARSALL. HYDRAULIC APPARATUS FOR RAISING on FORGING WATER, &(

No. 587,063. Patented July 27, 1897.

l/l/i/nnsss. I fa QM v 2. j

UNITED STATES PATENT OFFICEa HOWVARD D. PEARSALL, OF LONDON, ENGLAND.

HYDRAULIC APPARATUS FOR RAISING OR FORCING WATER, 80C.

. SPECIFICATION forming part of Letters Patent No. 587,063, dated July 27, 1897. Application filed October 31, 1892. Serial No. 450,598. (No model.) Patented in England January 4, 1889, N0. 183.

To all whmn it may concern.-

Be it known that I, HOWARD DEVENISH PEARSALL, a subject of the Queen of Great Britain, residing in London, England, have invented a new and useful Improvement in Hydraulic Apparatus for Raising or Forcing Water and other Liquids or for Forcing or Exhausting Air and other Gases, (for which substantially I have obtained, in conjunction with J. WV. Gordon, of London, a patent in Great Britain, No. 183, bearing date January 4, 1889,) of which the following is a specification.

My invention relates to improvements in hydraulic engines such as are described in the specification of United States Patent No.

382,380, dated May 8, 1888, granted to me; and the object of this improvement is to more easily regulate the quantity of air to be compressed during one stroke of the engine.

. Figure 1 shows so much of the old structure as is necessary to illustrate the connection of this invention therewith. In this figure, h is a tube or passage by which air is admitted at each stroke to fill the receiver or ante-chamber c, a part of such air afterward escaping again through the same tube h, the part which does not escape being then compressed and forced into the air vessel or through the valve d. The object desired is to exactly regulate the quantity of air thus retained.

According to this improvement I attain that object by the mechanism shown in Figs. 2 and 3. The tube It corresponds with the tube h in Fig. 1, and y is the roof of the receiver 0, as in Fig. 1. Inside the tube h there is another tube z, sliding in it, and attached to the tube a is a screwed rod 10, passing through a bracket 1) and having two nuts 6 e, (in the form of hand -wheels.) By means of these hand-wheels the tube 2' can be raised or lowered and fixed at any desired height. When the tube .2 has the position shown in Fig. 2- viz. projecting below the roof y of the chamber cit is evident that so much air as is above the lower edge of the tube a is trapped and cannot escape. Hence by adjusting the position of the tube zby means of the handwheels e e the quantity of air so retained is regulated. There is, however, another necessary part of this apparatus-viz., a Valveas without this although the air cannot escape the water will. In Fig. 2 this is an equilibi-iumwalve, consisting of two parts ff, one of which is slightly larger than the other. It is closed by the action of the water,which flows up the tube 2 and passes a helix g, attached to a spindle is. The water pressing on this helix causes the spindle 70 to revolve through part of a turn. Near the top of this spindle is a cam Z,which presses on a projection on on the stem n,which carries and guides the valve, so that when the spindle turns to the left it closes the valve. To make this clearer, the stem n and the cam Zare also shown in plan, Fig. 3.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In ahydraulic ram, the combination with the main supply-pipe, the receiving-chamber, the superposed air-chamber, the valve between these two chambers, the valve-controlled port establishing communication between said receiving-chamber and the outer air, and the main valve in said receivingchamber, of avertically-movable tube depending from and adjustable through the top wall of said receiving-chamber, and valves adapted to close the outlet from said movable tube, and means for operating said valves, substantially as described.

2. In a hydraulic ram, the combination with the main supply-pipe, the receiving-chamber, the superposed air-chamber, the valve between these two chambers, the valve-controlled port establishing communication between said receiving-chamber and the outer air, the main valve in said receiving-chamber, and a vertically-movable tube depending from and adjustable through the top wall of said receiving-chamber, and valves adapted to close the outlet from said movable tube, of the means for operating said valves consisting of a helix, a spindle, a cam, and a projection on the stem of aforesaid valves, substantially as described.

London, the 31st day of July, 1891.

HOWARD D. PEARSALL.

WVitnesses:

E. COURTNEY WALKER, HERBERT SELLEY. 

